3 springs to allow you to set your fuel pressure to the performance levels that you wish to achieve
for 1999 - 2003 Ford 7.3L Diesel
Three different fuel pressure spring settings*
58-61 psi silver spring (Stock pressure)
62-65 psi gold spring
67-70 psi black spring
*Note: Fuel pressure data was gathered by using a analog mechanical guage on a test bench using a 2001 fuel bowl with no fuel filter and a Walbro GSL-392 fuel pump. The housing was then moved to live testing on a 2002 7.3L F350 and using multiple springs, a digital fuel pressure gauge rated at 1/2 of 1% accuracy and a stock Ford Bosch fuel pump, identical data was collected. Due to accuracy tolerances of various pressure gauges and spring tensions from the manufacturing process, your pressure readings could have variances from these results.